Donald Worster (born 1941) is an American environmental historian who was, until his retirement, the Hall Distinguished Professor of American History at the University of Kansas. He is one of the founders of, and leading figures in, the field of environmental history. In 2009, he was named to the American Academy of Arts and Sciences. After retirement from University of Kansas, he became Distinguished Foreign Expert and senior professor in the School of History of Renmin University of China.